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1. 北京交通大学 电子信息工程学院 北京,100044
2. 北京信息科技大学 自动化学院 北京,100101
纸质出版日期:2017-1-5,
收稿日期:2016-6-15,
修回日期:2016-7-28,
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马航, 李邓化, 陈雯柏等. 电子传输层厚度及阻塞层对量子点发光二极管性能的影响[J]. 发光学报, 2017,38(1): 85-90
MA Hang, LI Deng-hua, CHEN Wen-bai etc. Influence of Thickness of Electron Transport Layer and Block Layer on The Properties of Quantum Dot Light Emitting Diodes[J]. Chinese Journal of Luminescence, 2017,38(1): 85-90
马航, 李邓化, 陈雯柏等. 电子传输层厚度及阻塞层对量子点发光二极管性能的影响[J]. 发光学报, 2017,38(1): 85-90 DOI: 10.3788/fgxb20173801.0085.
MA Hang, LI Deng-hua, CHEN Wen-bai etc. Influence of Thickness of Electron Transport Layer and Block Layer on The Properties of Quantum Dot Light Emitting Diodes[J]. Chinese Journal of Luminescence, 2017,38(1): 85-90 DOI: 10.3788/fgxb20173801.0085.
针对量子点发光二极管(QLED)中载流子注入不平衡的问题,对空穴和电子在量子点层的注入速率进行了研究。制备了不同电子传输层厚度、结构为ITO/PEDOT∶PSS/Poly-TPD/QDs/Alq
3
/Al的QLED样品。Alq
3
厚度由25 nm逐步递增至45 nm时,器件的开启电压升高,器件均发出量子点的红光。当Alq
3
厚度为30 nm时,器件的电流效率最高。此时,空穴和电子在量子点层的注入速率达到相对平衡。为进一步研究器件的发光特性,在QDs和Alq
3
接触界面嵌入电子阻塞层TPD。研究发现,当TPD的厚度为1 nm时,器件发出红光;当TPD厚度为3 nm和5 nm时,器件开始出现绿光。实验结果表明,在选取电子阻塞层时,应选择LUMO较低的材料且阻塞层的厚度必须很薄。
In view of carrier injection unbalance problem of the quantum dot light emitting diode (QLED)
the injection rate of holes and electrons in the quantum dots (QDs) layer was studied. QLED with structure of ITO/PEDOT:PSS/Poly-TPD/QDs/Alq
3
was fabricated. The experiment results show that all the devices exhibit red light and the turn-on voltage rises as the Alq
3
thickness increases from 25 nm to 45 nm. When the Alq
3
thickness is 30 nm
the current efficiency of the device is high and the injection rate of holes and electrons in the QDs layer reaches a relative balance. Then
the luminescence properties of the devices were further studied through imbedding an electron blocking layer TPD into the QDs/Alq
3
interface. When the TPD thickness is 1 nm
the device still exhibits red light
and green light begins to appear when the TPD thickness is 3 nm and 5 nm. The experiment results show that a thinner thickness and lower LUMO should be chosen for the electron blocking layer.
量子点发光二极管厚度能级电流密度亮度电流效率
quantum dot light emitting diodethicknessenergy levelcurrent densityluminancecurrent efficiency
COE S, WOO W K, BAWENDI M, et al.. Electroluminescence from single monolayers of nanocrystals in molecular organic devices[J]. Nature, 2002, 420(6917):800-803.
SCHLAMP M C, PENG X G, ALIVISATOS A P. Improved efficiencies in light emitting diodes made with CdSe(CdS) core/shell type nanocrystals and a semiconducting polymer[J]. J. Appl. Phys., 1997, 82(11):5837-5842.
ANIKEEVA P O, HALPERT J E, BAWENDI M G, et al.. Quantum dot light-emitting devices with electroluminescence tunable over the entire visible spectrum[J]. Nano Lett.,2009, 9(7):2532-2536.
SUPRAN G J, SHIRASAKI Y, SONG K W, et al.. QLEDs for displays and solid-state lighting[J]. MRS Bull., 2013, 38(9):703-711.
COLVIN V L, SCHLAMP M C, ALIVISATOS A P. Light-emitting diodes made from cadmium selenidenanocrystals and a semiconducting polymer[J]. Nature, 1994, 370(6488):354-357.
CHO K S, LEE E K, JOO W J, et al.. High-performance crosslinked colloidal quantum-dot light-emitting diodes[J]. Nat. Photon., 2009, 3(6):341-345.
SUN Q J, WANG Y A, LI L S, et al.. Bright, multicoloured light-emitting diodes based on quantum dots[J]. Nat. Photonics, 2007, 1(12):717-722.
QIAN L, ZHENG Y, XUE J G, et al.. Stable and efficient quantum-dot light-emitting diodes based on solution-processed multilayer structures[J]. Nat. Photon., 2011, 5(9):543-548.
DAI X L, ZHANG Z X, JIN Y Z, et al.. Solution-processed, high-performance light-emitting diodes based on quantum dots[J]. Nature, 2014, 515(7525):96-99.
DING T, YANG X Y, KE L, et al.. Improved quantum dot light-emitting diodes with a cathode interfacial layer[J]. Org. Electron., 2016, 32:89-93.
CARUGE J M, HALPERT J E, WOOD V, et al.. Colloidal quantum-dot light-emitting diodes with metal-oxide charge transport layers[J]. Nat. Photon., 2008, 2(4):247-250.
ZHANG X L, DAI H T, ZHAO J L, et al.. Effects of the thickness of NiO hole transport layer on the performance of all-inorganic quantum dot light emitting diode[J]. Thin Solid Films, 2014, 567:72-76.
TANG L Y, ZHAO J L, ZHANG X L, et al. Enhanced electroluminescence of all-inorganic colloidal quantum dot light-emitting diode by optimising the MoO3 intermediate layer[J]. IET Micro Nano Lett., 2014, 9(6):421-424.
JI W Y, TIAN Y, ZENG Q H, et al.. Efficient quantum dot light-emitting diodes by controlling the carrier accumulation and exciton formation[J]. ACS Appl. Mater. Interf., 2014, 6(16):14001-14007.
彭辉仁, 陈树明, 王忆. 基于聚合物-量子点共混的量子点发光二极管[J]. 发光学报, 2016, 37(3):299-304. PENG H R, CHEN S M, WANG Y. Quantum dot light-emitting diodes with mixed polymer-quantum dots light-emitting layer[J]. Chin. J. Lumin., 2016, 37(3):299-304. (in Chinese)
胡炼, 吴惠桢. 基于量子点-CBP混合层的量子点LED的制备[J]. 发光学报, 2015, 36(10):1106-1112. HU L, WU H Z. Preparation of quantum dot light-emitting diodes based on the quantum dots-CBP hybrid[J]. Chin. J. Lumin., 2015, 36(10):1106-1112. (in Chinese)
PARKER I D. Carrier tunneling and device characteristics in polymer light-emitting diodes[J]. J. Appl. Phys., 1994, 75(3):1656-1666.
CARUGE J M, HALPERT J E, BULOVIC' V, et al.. NiO as an inorganic hole-transporting layer in quantum-dot light-emitting devices[J]. Nano Lett., 2006, 6(12):2991-2994.
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